Abstract
Filter paper strips combined with screen-printed carbon electrodes (SPCE) were used in the assembly of a microfluidic device for detecting Pb(II) and Cd(II) in aqueous samples. The portable microfluidic device (with direct electrochemical detection) was tested for direct quantification of multiple analytes (Pb(II) and Cd(II)) in contaminated aqueous samples without pretreatment. Square wave anodic stripping voltammetric (SWASV) signal was greatly enhanced and displayed excellent analytical performance for Pb(II) and Cd(II) detection (from 0 to 100 ppb) with low limit of detection of 2.0 and 2.3 ppb, respectively. The proposed electrochemical devices also exhibited good selectivity and stability for analyses of real samples of gas dissolved salty soda water and ground water with physical contamination. The device is simple, low-cost, easy-to-fabricate and portable. This analytical device has the possibility of being useful for point-of-care applications in environmental monitoring, public health and food safety.
Highlights
Analytical instrumentations tend to be miniaturization and intellectualization for in situ applications.[1,2,3,4] it can be convenient for real-time and on-line monitoring in the fields of environmental monitoring, biomedical science, agriculture, military analysis and industrial process monitoring, etc
Our group exploited the advantage of filter paper to develop a paper disk impregnated with reagents on screen-printed carbon electrodes (SPCE) for a trace metal assay, Pb(II) could be measured with one-step method based on internal standard.[11,12]
We describe a design of strips of filter paper integrated commercial SPCE for electrochemical detection of Pb(II) and Cd(II) in aqueous samples
Summary
Analytical instrumentations tend to be miniaturization and intellectualization for in situ applications.[1,2,3,4] it can be convenient for real-time and on-line monitoring in the fields of environmental monitoring, biomedical science, agriculture, military analysis and industrial process monitoring, etc. Using μPEDs, they demonstrated the detection and quantification of glucose in artificial urine by chronoamperometric analysis based on glucose oxidase They further demonstrated the use of μPEDs for analysis of Pb(II) in an aqueous solution.[18] Paper‐based separation device was applied for the separation and quantification of uric and ascorbic acid.[19] Our group exploited the advantage of filter paper to develop a paper disk impregnated with reagents on SPCE for a trace metal assay, Pb(II) could be measured with one-step method based on internal standard.[11,12] Paper-based integration created a multifunctional device that can be applied in point-of-care testing in environmental or industrial monitoring of different analytes.[17,20,21]
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